var http = require('http');

http.createServer( function(req, res){
	//去掉query_string 查询字符串
	var path = req.url.replace(/\/?(?:\?.*)$/,'').toLowerCase();

	//解析uri
	switch(path){
		case '': 
			res. writeHead( 200, { 'Content-Type': 'text/plain' }); 
			res. end('Homepage'); 
			break; 
		case '/about': 
			res. writeHead( 200, { 'Content-Type': 'text/plain' }); 
			res. end('About'); 
			break; 
		default:
			res. writeHead( 404, { 'Content-Type': 'text/plain' }); 
			res. end('Not Found'); 
			break;
	}
}).listen(3000);

console.log("start on 3000");